Titanium dioxide (TiO₂) is one of the most attractive transition-metal oxides because of its superior physical and chemical properties, which has been widely applied in environmental cleanup (photocatalytic pollution removal), energy conversion (hydrogen production, solar cells), energy storage (lithium batteries and supercapacitors), security (sensors), panel display (transparent conducting films), biomedical devices, and so on. The performance of TiO₂ in these applications highly depends on its structural, electronic, optical, and morphological as well as the surface properties (exposed facets). Great effort has been devoted to adjust these properties and apparent progress has been made on the synthesis of the 0-, 1-, 2-, and 3-dimensional nanostructured TiO₂ materials. Nevertheless, further investigations are required on the development of new synthetic methods and the understanding of its relationship between the intrinsic properties and performance, to facilitate the commercialization of TiO₂-based materials in advanced environmental and energy-related areas.

In this special issue, we invite scientists to contribute their original research papers and review articles that cover recent progress on the synthesis and applications of TiO₂-based nanomaterials. This issue covers a broad range of subjects from theoretical calculations, nanosynthesis, advanced characterization, and modifications to environmental and energy-related applications and devices. In particularly, we are interested in the studies that can provide new insight or stimulate novel idea to promote the research in this field to a higher level.

Potential topics include, but are not limited to:

• Design and synthesis of novel TiO₂ nanomaterials, including nanocomposite structures, hybrid configurations, low-dimensional nanostructures, and thin films
• Modification strategies for TiO₂-based nanomaterials, including doping, compositing, nanoengineering, exposed facets tailoring, and surface disorder engineering (black-TiO₂)
• Advanced techniques for characterization of TiO₂-based nanomaterials
• TiO₂-based devices for environmental and energy-related applications such as photocatalysis, photovoltaics, lithium batteries, supercapacitors, and sensors
• TiO₂-related materials under extreme conditions: high pressure, high temperature, shock wave, radiation, and so on
• Theoretical modelling and understanding of the relationship between structural, electronic, optical, and morphological properties